Professor Yotam Shem-Tov Awarded 2025 Sloan Research Fellowship

Portrait of Yotam Shem-Tov

We are proud to congratulate Professor Yotam Shem-Tov, one of the 2025 winners of the prestigious Sloan Research Fellowship. The Sloan Fellowships are extremely competitive awards with just a handful of recipients selected each year from among the best scientists throughout the United States and Canada.  Fellowships are awarded in the areas of Chemistry, Computer Science, Earth and Space Science, Economics, Mathematics, Neuroscience and Physics.  Candidates must be nominated by other scholars and the winners are selected by a committee of experts in the respective fields.

Professor Shem-Tov is a labor economist who studies the criminal justice system, examining such issues as the effect of sentencing practices on recidivism and the impact of incarceration on employment outcomes. Some of his most recent work, focusing on the effectiveness of restorative justice has shown that such programs can reduce recidivism rates by 23 percent.  His work has been published in leading economics journals such as Econometrica, the Journal of Political Economy, and the Review of Economics and Statistics.     

Yotam received his PhD in Economics from the University of California, Berkeley in 2019 and came to UCLA in 2020 as an assistant professor.  He teaches Undergraduate Labor Economics and a graduate course in the same field.

Yotam joins recent past Sloan winners in the Department including David Baqaee (2022), Natalie Bau (2022),  Denis Chetverikov (2019), and Pablo Fajgelbaum (2017).

 

Related Links:

Sloan Foundation | 2025 Sloan Foundation Research Fellowship Recipients

Sloan Foundation | 2025 Sloan Research Fellows Press Announcement

UCLA Newsroom | UCLA tops public universities in number of 2025 Sloan Research Fellows

UCLA Social Sciences NewsUCLA economics professor Yotam Shem-Tov receives 2025 Sloan Research Fellowship

Jacob Kohlhepp wins the Oliver Williamson Best Conference Paper Award

Jacob Kohlhepp, who received his Ph.D. from the UCLA economics department in 2023 and is now a Professor at the University of North Carolina, was awarded the Oliver Williamson Best Conference Paper Award for his paper “The Inner Beauty of Firms.” The award is given to the best paper presented at the Society for Institutional & Organizational Economics conference.
The award announcement can be found here.
Jacob’s paper can be found here.

Paper by UCLA Professor Pablo Fajgelbaum Featured in the Economist and Reuters

The paper “The Value of De Minimis Imports” by UCLA Professor Pablo Fajgelbaum and coauthor Amit Khandelwal (Yale) was featured in the Economist and Reuters. The paper studies the effect of subjecting imports of $800 or less, which currently enter the US duty-free, to tariffs. The paper main finding is that the cost would fall disproportionately on lower-income consumers.
The paper can be found here.
The Economist article can be found here.
The Reuters article can be found here.

Professor Dora Costa Featured in The New York Times: Exploring Historical Perspectives on American Health

Our faculty member, Professor Dora Costa, was featured in a recent New York Times article titled Have Americans Really Been Healthy?. The article explores the historical context of health in the United States, with Professor Costa providing insights into the challenges of American diets and lifestyle in the 19th and early 20th centuries. She highlights how limited access to fresh produce and cultural habits, such as heavy drinking, shaped public health during that era. Read more about her fascinating contributions in this engaging piece.

The National Institute of Health Awards UCLA Professor Adriana Lleras-Muney an R01 Grant

Adriana Lleras-Muney

Professor Adriana Lleras-Muney receives R01 Grant from the National Institute of Health for her research project “The Effect of Childhood Environments on Adult Health and Mortality”. “In the project, Professor Lleras-Muney constructs a new dataset linking individual childhood environments at a granular level to individual life spans for large representative samples of Blacks and Whites. She follows the approaches of previous work to investigate the causal effects of childhood environments on longevity.She focuses on two important areas with the potential to have large and long lasting effects on health and longevity: school and the disease environments. To estimate the impacts of school, she uses newly digitized data at the city level on the determinants of school quality (e.g. teacher pay) and follows previous approaches in the literature, but estimates them at the city level and tracks mortality outcomes for the entire lifetime of individuals. To estimate the causal effects of childhood infections, she will build on existing evidence that there was an important reduction in infectious disease mortality in cities in the 1920s due to reduced immigration and the associated improvement in living conditions that prevailed in cities. She will conduct the analysis separately by race. She will also examine the interaction of the childhood education environment and infectious disease environment on longevity and their joint effects on racial disparities.”

Paper by UCLA Professor Joao Guerreiro featured in Bloomberg

The paper “Why Do Workers Dislike Inflation? Wage Erosion and Conflict Costs” by UCLA Professor Joao Guerreiro and co-authors Jonathon Hazell, Chen Lian, and Christina Patterson was featured in Bloomberg. The paper provides a potential explanation for why workers dislike inflation. It argues that, with inflation, workers must take costly actions to ensure their nominal wages keep pace with rising prices. These costly actions reduce workers’ welfare even when their nominal wages keep up with inflation. Survey data support this explanation. The paper can be found here

The Bloomberg article here.

UCLA Professor John Asker Named Econometric Society Fellow

UCLA professor John Asker was named Econometric Society Fellow. The Econometric Society is an international society for the advancement of economic theory in its relation to statistics and mathematics. More information about the Econometric Society can be found here.

Paper by UCLA Professor Pablo Fajgelbaum Featured in the New York Times

The paper “The Value of De Minimis Imports” by UCLA Professor Pablo Fajgelbaum and coauthor Amit Khandelwal (Yale) was featured in the New York Times. The paper studies the effect of subjecting imports of $800 or less, which currently enter the US duty-free, to tariffs. The paper main finding is that the cost would fall disproportionately on lower-income consumers.
The paper can be found here.
The New York Times article can be found here.

The Impact of Commercial Real Estate Regulations on U.S. Output

By Lee Ohanian

Lee Ohanian

Many of the most important venture capital firms in the United States are located on Sand Hill Road in Menlo Park, California. These firms have helped grow many new and emerging technology companies that would go on to contribute to the transformation of the global economy, including Microsoft, Apple, Google, Amazon, and Spotify. However, at the end of Sand Hill Road, just a stone’s throw from these remarkably important venture capital firms is farmland where cows graze. What are cows doing on perhaps the most valuable commercial land in the United States? The cows are there because of regulations that prevent that land from being used for other commercial purposes.

Sand Hill Road is perhaps the most striking example of how land-use regulations affect US economic activity. In the case of Sand Hill Road, zoning stipulates the type of economic activity that can take place on a parcel of land. Zoning also regulates the size of commercial buildings on that land. Most venture capital firms on Sand Hill Road cannot be taller than two stories.

Zoning is the most common land-use regulation in the United States, affecting the scale and scope of commercial economic activity. Other regulations include environmental restrictions, which can significantly affect commercial projects through costly environmental impact reviews and the threat (and use) of environmental lawsuits to limit (or deny) development. Further complications arise when community groups influence development by exerting political pressure on state and local politicians.

Economists and policymakers have been actively studying the outcomes of these regulations on economic activity and consumer welfare in recent years. Progress has been made in quantifying the impact of residential land-use regulations that limit the amount of housing that can be built on a parcel of land. However, the effect of land-use regulations on commercial buildings are virtually unstudied.

The major challenge in analyzing regulatory impact is that commercial activity in some cities is subject to dozens, even hundreds, of regulations. Moreover, it is virtually impossible to quantify these regulations because zoning codebooks are frequently out of date, some buildings are exempted from regulations, and unofficial “shadow regulations” also affect outcomes, such as the threat of a lawsuit by an environmental group that is withdrawn if a developer agrees to build on a smaller scale than planned. Finally, the arbitrary nature of some regulations’ boundaries can cause further computational complications; regulations may differ between buildings that are across the street from each other or that even share a common wall.

In “The Impact of Commercial Real Estate Regulations on U.S. Output,” Professor Ohanian and his coauthors, Fil Babalievsky and Kyle Herkenhoff, develop an economic modeling framework that addresses these challenges. The key insight is that commercial buildings developed on the most valuable land—such as Sand Hill Road in Menlo Park, California, or parcels in midtown Manhattan—should be large. From society’s perspective, valuable land signifies a highly productive location, which means that society benefits from having a large building to leverage the location’s productivity. From the developer’s perspective, valuable land means a large expense, but this expense can be spread over the square footage of a large building. In the case of highly valuable land, both society and developers benefit from creating a large commercial space.

The size of a building relative to the value of a parcel of land is influenced by the stringency of the land-use regulations governing the parcel. For example, the skyscrapers in midtown and downtown Manhattan that sit on extremely valuable land indicate that commercial land-use regulations are relatively small and thus allow for building larger structures. On the other hand, the very small buildings

that are home to Silicon Valley venture capital firms on the extremely valuable land on Sand Hill Road indicate very stringent land-use regulations, which deny larger buildings.

Professor Ohanian and coauthors use this concept to quantify the stringency of these regulations by collecting tax assessment data from most commercial building parcels in the United States. Their approach requires only two numbers: the assessor’s total valuation of a parcel and the amount of that valuation accounted for by just the structure that sits on the land. On Sand Hill Road, much less of the total value of a commercial parcel is accounted for by the structure, while in midtown Manhattan, much more of the total value is accounted for by the structure.

Given this simple but powerful economic logic, Professor Ohanian’s and coauthors’ analysis develops an economic model comprising the more than two hundred metropolitan statistical areas (MSAs) of the United States. The model calculates the regulation stringency at the individual parcel level, aggregates the individual parcels to the MSA level, and then aggregates each of the MSAs to the national level. The analysis finds that the least-regulated MSA is Midland, Texas, known as the “Tall City” for its towering buildings. Los Angeles and San Jose are among the most-regulated MSAs, having smaller commercial buildings that account for less of the total value of commercial parcels than the average of all MSAs. The model accounts for the positive role of land-use regulations that limit the congestion arising from completely unfettered land use in a city. Thus, the model recognizes the potential benefits of some regulations.

The analysis conducts several policy experiments that assess how real US GDP, as well as consumer welfare and developer profits, would be affected if land-use regulations were changed. One experiment analyzes what would happen if all MSAs adopted the relatively low level of land use regulation found in Midland, Texas. With this policy reform, Professor Ohanian and coauthors find that real US GDP would increase by about 3 percent in perpetuity, or about $1 trillion per year. The amount of commercial square footage would increase by around 15 percent under this scenario. Consumers would benefit from this change, as a better allocation of land use would increase their incomes, boost their consumption, and allow them to work less. The results of this experiment indicate that the U.S. present land-use regulations are far too stringent.

Commercial business developers are the only ones who would not benefit from this reform, as their profits would decline modestly. In the current regulatory environment, policies that artificially constrain commercial space allow some commercial developers to earn premium rents. This reflects the fact that the amount of commercial office space increases with policy deregulation, thereby reducing the value of commercial space on a per-square-foot basis. This finding suggests that at least some aspects of commercial regulation reflect the self-interest of those who develop commercial space rather than advancing public-minded goals, such as limiting urban congestion.

The positive effect of reducing commercial land use regulation is conservatively reported here. The paper’s estimate of the economic impact of deregulation considers only the average level of regulation within an MSA and does not account for the varied stringency of regulations within individual MSAs. Reducing the high stringency of regulations within select regions could easily double the economic benefits of deregulating commercial buildings, leading to even higher consumer welfare, income, and production.